Character Gallery Relationships
Don't you mean Cake at Stake?

X is a mathematics variable and the co-host of Battle for BFDI (formerly the host when Four was gone).

X's first appearance in BFB was in Getting Teardrop to Talk where he and Four lead a game to win "a BFDI" (which means the winner will get another Battle for Dream Island). X appeared alongside Four, another abstract being representing a real-life number or variable.


X is simply a drawing of the letter X with a yellow body and lighter yellow limbs. Similar to Four, he is purposefully drawn simplistically, with different assets and four fingers.


X seems to be much more friendly than his partner Four, and is usually seen to be quite happy and friendly towards almost every contestant. However, X also seems to be quite soft, as he cries after Four stated that nobody noticed his disappearance (despite Cloudy asking about X), and became frightened after Four screeched at him. He can also be considered a bit ignorant, such as congratulating the ground for "catching" BEEP after they fell from their plane, or even asking to get screeched by Four. He also shows to get very nervous under pressure. As he hosts in This Episode Is About Basketball, he's very hesitant while talking and tends to mess up things, such as reading the votes backwards when Free Food is getting their votes calculated. X is also quite docile by nature and remains loyal to Four, even after the times Four has mistreated him.

After Donut's reassurance in the stinger for This Episode Is About Basketball, X becomes much more confident in his actions and hosting ability. He is the second character who cries in BFB, the first being Bubble. Despite this, X still remains cheery and polite.


  • Levitation: As shown in Getting Teardrop to Talk and Fortunate Ben, X has the ability to float in mid-air. In Get to the Top in 500 Steps, he levitated to the top of the viewer's screen. Both Four and X have to idly stare at the viewers in order for the ability to work
  • Teleportation: He can also seemingly teleport, as he got back up his platform after being knocked back by one of his baskets.
  • Construction: He can also build really quickly, as he built the challenge station for This Episode Is About Basketball in 3 seconds (3:26- 3:29).
  • Regeneration: In Enter the Exit, X was shown to heal his leg almost immediately after Pie dislocated it to make a 4. It also seems that he can reattach entire limbs with nothing but bandages in Fortunate Ben.
  • Pain resistance: When Pie dislocated his leg, he took it with no more than an "Ow!"
  • Shape-shifting: As shown in What Do You Think of Roleplay?, both X and Four have the ability to shape-shift, or change their physical appearance.


X plays a role as Four's assistant.

He sets up some of the the challenges, as seen in Getting Teardrop to Talk, where the contestants must reach X to bring his baskets back, and in Fortunate Ben, in which the contestants must keep their respective teams' plane in the air as long as possible. X is the person who hands out prizes to the safe competitors at Cake at Stake.

He hosts Cake at Stake and sets up the challenge in This Episode Is About Basketball as a temporary replacement for Four.


X's first appearance was in a 2008 animation X Finds Out His Value along with Four, nine years before first appearing in BFB, with Four possibly making up as a host and running gag because of the season they first come back in. This also shows that X doesn't refer to the English letter, but the algebraic variable or the mathematical symbol of multiplication.

X played a major role in the challenge in Getting Teardrop to Talk. The contestants had to return his baskets back to X, who was standing on a tall platform, in order to avoid elimination. At the end of the episode, X puts on 4 of his baskets on the night, causing him to spin fast eventually.

X and 4

X with a basket.

In Lick Your Way To Freedom, X collaborates in the Cake at Stake as the character who throws the cakes, with Four being the one who says who is safe and who goes home/gets eliminated. Later in the episode, he warns BEEP that Four won't like the fact that Roboty was missing. Once BEEP loses, X tells them that one of them will be eliminated.

In Why Would You Do This on a Swingset, X reminds Four that it's called Cake at Stake, and not Brake at Flake, prompting Four to insult X. Four later causes X to cry when they say that nobody noticed he was gone (despite Cloudy noticing).

In Today's Very Special Episode, Four once again causes X to cry during Cake at Stake when X got the number of votes wrong. X also translates Four's muffled speech. X assists Four in placing the team tags on the rating scale during the challenge and offers his opinion on iance's and Death P.A.C.T.'s make-overs. The Loser's make-over was a papier-mâché mold which was encasing X, which may have contributed to their low placing at 7th.

In Fortunate Ben, X insulted Pen as, after Four started screeching, he stated that he is a "disgrace to the entire art community." Four said that he was thrown in the limb reattachment center, but when BEEP collided with the cliff in the challenge, he thanks the ground. In the stinger, he is "dancing" (on which is actually swinging its hands) with 2 singers, one distorted, and one low-pitched in the audio.

In Four Goes Too Far, X first appeared at Cake at Stake. Four asked X that who's also safe. X answered by mentioning all of the contestants from BEEP except for Cloudy, David and Roboty. When A Better Name Than That was pushing Donut to the sledding, they also have got X, then Four. X ran away and was hiding in one of his baskets off-screen. X was not seen in this episode and beyond this event until the beginning of the 8th episode.

In The Liar Ball You Don't Want, X is hiding at a fragment of Jawbreaker. (This, however was not shown onscreen.)


Gelatin biting X.

In Questions Answered, the top of X is seen in Fries' box. Gelatin describes them as swollen fries.

X returns in This Episode Is About Basketball, Gelatin tries to take some of Fries' fries, but ends up biting X. X screams out of pain, causing him to be found. X, when questioned, revealed that he ran away after Four got multiplied and hid the whole time because he got scared. Donut, sick of hosting, puts X into his position. X accidentally reads the voting results backwards, revealing the results from most voted to least rather than the opposite. Later X tries to think of a challenge, and after some time, decides on a basketball contest. At the end of the episode, Donut is walking past X, and tells him "Good job today." X simply smiles in response.

In Enter The Exit, X approaches Cloudy. Cloudy tells him that he has missed Balloony, and asks if he can recover him. X interrupts him, and says that he cannot recover him, however, he does tell him that he is safe. Later, in Cake at Stake, X reads the voting results for Beep, until it went down to David being eliminated. Because of his elimination, David quickly runs away. X chases him down, and managed to catch up to him, shoving him inside his head. Eventually, once that is cleared up, X returns, only to find the contestants arguing. X grabs their attention to tell them the 10th contest, however, gets interrupted by Clock by telling them to bring back Four. Once Four was extracted from Donut by Firey and shaped by Pin, X missed him and had hugged him.

In Get to the Top in 500 Steps X confirms to Four that he missed a lot and shows what to do in the challenge while Four describes the challenge

In What Do You Think of Roleplay? X (disguised as Four) and Four (disguised as X) are discovered that they’ve switched minds because Four (disguised as X) can’t bring back contestants and X can.

He is later heard disguised as Four when iance was declared safe, making a joke about Team Ice Cube! being up for elimination. Four (disguised as X) says that the joke was horrible, and X answers with the fact that, since they switched bodies again, Four technically told the joke. They start to argue, but eventually Four gives up.


Total Deaths: None


Total Kills: 1

Character Number of times killed Episodes
Bubble 1 Enter The Exit


  • X's true value is 7, as seen in X Finds Out His Value.
  • X appears in the game Tidepool, as a level 24 creature.
  • X appears to be omnipotent, like Four, but to a somewhat lesser extent.
  • According to Four, X has a collection of baskets.
    • However, this could only be for challenges.
    • X has around 40 baskets.
  • In Getting Teardrop to Talk, when X receives a basket from The Losers!, he says "Yayay! So much value!", which may be a reference to X Finds Out His Value.
  • He has a somewhat sandy or stress ball-like texture.
  • X’s voice in X Finds Out His Value sounds very similar to Ice Cube’s original voice.
  • X is one of the 6 people to be seen crying on-screen in the entire series. The other 5 are Announcer, Bubble, Loser, Leafy, Ruby, & Spongy.
  • X is the second host to cry and the only host so far to cry actual tears.
  • In Today's Very Special Episode, he said he does not like roleplaying.
  • X was the first host to be dismembered (or, "dismembled"), in Fortunate Ben, by Four.
  • X made an appearance in The JingJing Squisher.
    • However, The JingJing Squisher is non-canon.
  • According to Cary in his reaction to Getting Teardrop to Talk, X is 20 times larger than a contestant, due to the size of his baskets. This means that BFB contains many sizing errors when X is seen next to a contestant.
    • This could also mean Four is about 30-40 times larger than a contestant, as he is taller than X.
    • However, X's baskets could likely be different sizes.
    • It's most likely that Cary was simply stating that X being the same size of his baskets was, in fact, a sizing error, and X isn't actually the same size as his baskets.
  • He is of the first characters (Not counting the limbless characters) to not have stick-figure arms or legs in the series, the other being Four.
  • In This Episode Is About Basketball, it is revealed he ran away when Four got multiplied by zero and then hid in one of his baskets and inside a piece of Jawbreaker (that Ruby was playing with).
    • X wasn't seen running away in Four Goes Too Far. However, it might have happened off-screen when the screen faded to white.
  • X seems to have no gender, along with Four, because in his world they don't have that.
  • In What Do You Think of Roleplay?, Four was able to suck up people, recover them, and maybe even zap them in X's body. However, X said he was unable to do that.
    • This might mean that X is able to do these powers but hasn't learned how.
  • X also appeared in The worst lie that Mickey Mouse ever told.
    • This video was non-canon.


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AnnouncerFlower Speaker BoxFirey Speaker BoxPuffball Speaker BoxTVFourXDonutHelloKevin
Interactions with Four, Donut
Other content X's Alarm Clock, Baskets, X Finds Out His Value